Genetic Nearsightedness Eye sight DNA Test A Genetic Nearsightedness Eye sight DNA Test may be able to explain why you are nearsighted and predict whether you have a genetic tendency to need glasses. Nearsightedness may be genetically coded in your DNA, but it may also be the result of environmental factors.Were you predestined to wear contacts or glasses? Is it becoming more difficult for you to see things that are far away? Are you concerned about a recent eye exam that didn